Well, an unusual question to answer, what what about something like this
Plot3D[.7*(1+Tanh[11 + Tanh[1 - (2*Y^2+X^2+X^42*Y^2 + X^2 + X^4)]) - .3*Exp[-X^2/.0025]*Exp[0025]* Exp[-(Y - .1)^2/.15] - .2*( Exp[-(X - .7)^2/.02]*Exp[-(Y - .0)^2/.08]+08] + Exp[-(X+X + .7)^2/.02]*Exp[-(Y - .0)^2/.08] ), {X, -1, 1}, {Y, -1, 1}] X and Y in [-1,1], Z in [0,2], i.e. cube.
You may play with RegionFunction->... and some parameters. ![enter image description here][1]
Actually, I did it in Python, but it isn't a Mathematica specific question, now is it? [1]: https://i.sstatic.net/32p9h.jpg